Why it works: Beans and flour are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 2,080 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
String Beans, Yellow Wax
Ingredients
Directions
Prepare
String the beans with a knife and break them in half.
Soak the beans in cold water for 30 minutes, then wash them.
Place the beans in a saucepan and cover with cold water.
Cook and serve
Boil the beans slowly for 3 hours, replenishing with boiling water if needed.
After 2 hours, mix the butter and flour, then stir into the beans.
Add the salt and cook for an additional hour until very soft.
For added flavor, stir in beef broth before serving.
Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.
Explore the science
The flavor team
The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.
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Beans + flourtop 11% of all pairsSmell alikemoderateCooked together2,080 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Beans + beeftop 12% of all pairsSmell alikemoderateCooked together1,134 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + beeftop 16% of all pairsSmell alikemoderateCooked together10,847 recipes
Shared aroma: 2-furfurylthiol (coffee, roasted).
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Beans + buttertop 19% of all pairsSmell alikemoderateCooked together2,799 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
Butter and flour barely smell alike, yet cooks put them together in 124,287 recipes: they work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Yellow wax beans
- Form the main body of the dish and soften into a tender vegetable over long simmering.
- Fresh butter
- Adds richness and fat, giving the beans a smooth, silky mouthfeel.
- Flour
- Mixed with butter and stirred in, it thickens the cooking liquid slightly.
The step that matters
Boil the beans slowly for 3 hours. A gentle simmer softens the beans evenly without breaking them apart. Keeping the cooking liquid topped up with boiling water, rather than cold, prevents the pot from stalling and the beans from toughening.
Swap the beans
How well each one fits the dish's main ingredients (butter, flour, beef):
- Almondfits better
- Chestnutfits about as well
- Peanutfits about as well
- Beansthe original
Fit is the average pairing score against butter, flour, beef. Candidates are from the same food group and used in at least 100 recipes.
“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.
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